Rotary pump.



D. C. BAKER da H. F. HANSEN. ROTARY PUMP. APPLICATION FILED JAN. 21, 1911'. Y*

` Patsnted Jan. 5, 1915.

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ROTARY PUMP. APPLICATION FILD JAN.21, 1914.

Patented 5311.5, 1915.

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f para t- DEXTER C. BAKER AND HARVEY F. HANSEN, OF OAKLAND, CALIFORNIA, ASSIGNORS T BAKER-HANSEN MANUFACTURING COMPANY, 0F EAST OAKLAND, CALIFORNIA,

A CORPORATION OF CALIFORNIA.

ROTARY PUMP.

Application filed. January 2l, 1914. Serial No. 813,493.

1o all whom t may concern.'

Bc it known that we, DEXTER C. BAKER and HARVEY F.' HANSEN, citizens of the UnitedStates, residing at Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in Rotary Pumps; and We do hereby declare the following to be a full clear, and exact description of the invention, such as will enable others skilled in the art to which it lappertains to make and use the Sam.

The primary object of this invention' is to provide a rotary pump of extremely sim- With these and other objects in view as will become more apparent as the description proceeds, the invention consists-'in certain novel features of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding of our invention, reference is to be had to the following description and accompanying drawings, in whichl Figure 1 is a side elevation of our improved rotary pump with one of the heads removed, Fig. 2 is a vertical sectional View on a plane passing centrally through the pump, Fig. 3 is a central vertical section through the pump, taken on a plane at right angles to the axis of the pump shaft, the rotor being omitted, Fig. t is an outside elevation of one ofthe cylinder heads, Fig. 5 is a perspective view of the rotor, and Fig. 6 is a view taken on the plane of line 6 6 of Fig. 5.

Referring in. detail to the drawings by numerals, 10 designates, as an entirety, the cylinder or body of the pump, having flanges Patented Jan. 5, 1915.

11 and a, base 12. The cylinder is provided.

with an intake chamber 14 formed adjacent its inner end and on opposite sides thereof with a pair of discharge ports or openings 15 extending through the flangesll.

16 indicates the discharge chamber of the pump, said chamber being formed with openings or ports 17 extending through the flange 11.l

A pair of cylinder heads, designated as an entirety, by the numerals 18 and 19 are bolted or otherwise secured to the flanges 11 so as to close the central chamber of the cylinder, and are formed with bearings 2O and 21 which support a shaft 22 eccentrically within the cylinder. A runner or rotor 23 is keyed to the shaft 22 within the pump cylinder and is formed with a plurality yof radial slots 24 to accommodate sliding blades or pistons 25, 26, 27 and 28, and the inner ends of these slots are enlarged, as indicated by the numeral 29, for a purpose to be hereinafter explained. The rotor is also formed with a plurality of arcuate passages 30 arranged in pairs which open upon opposite sides of the rotor and which open upon the periphery thereof, as indicated by the numeral 31.

Referring to Fig. 5, it will be seen that the walls of the opening 31 are parallel ,to each other but are inclined tothe periphery of the rotor, forming acute angles with the plane of the adjacent blades. The centers of the arcuate passages 30 coincide with the center of the cpeningt32 'through which the shaft 22 extends. Circular plates 33 are secured to the sides of the4 rotor, ht within annular recesses 34 formed in the heads 18 and 19 and are provided with openings 35 which-register with the passages 30. These plates are for the vpurpose of assistingin the support of the rotor. and are found to .ister with the. ports 15 and the space between thepperiphery of the rotor and the cylinder wall respectively. The heads are.

also formed with eXits or discharge passages 39, each of which is formed with an arcuate opening 40, which open within the cylinder and a second opening 41 which registers with the port 17 in the discharge chamber 1.6. The slots 40 are concentric with the shaft 22 andhave the same radii as the passages 30, so that said'passages register with the slot as the rotor isrevolved. ,Ihe cylinder heads are also formed with passages 42 which open at their inner ends into annular valve chambers 43 and at their outer endsfupon a passage 44 formed in the cylinder 10, said passage communicating with an air chamber 45 and the discharge chamber 16, the latter connection being made by means of a passage 46, clearly shown in Fig. 3. A stationary disk valve 47 is arranged within each of theyalve chambers 43 and is formed with a plurality of arcuate ports 48 which establish communication between the inner enlarged ends29 of the radial slots 24 and thev valve chambers. The arrangement of the air chamber 45, passages 44 and 42, and the disk valve 47 provides for a pressure against the inner end of the blades equal to the pressure in the' discharge chamber 16, so that the blades will be held properly in their extended or projected position. It will be noted, upon reference to Fig. 1, that there is no outward pressure upon the blades when they are not projected or when they are traveling from the openings 17 to the intake openings 15, this being true, since the valve disks are unslotted through that portion of their area corresponding with the distance between said ports. ,n

Before proceeding to adescription of the operation of-our improved pump, we 4desire to direct `attention t the fact that those portions of.the peripheral wall of the cylinder chamber, forming the arcs a-b and c-d are concentric with the rotor, Whereas those portions forming thel arcs 1l-aand b-c are eccentric, and further, that as soon as a blade passes thel opening 38, the forward terminals of the passages 30, directlyin advance of said blade, move into registration with the forward end of the ports 40, and that the passages 30 remain in communica- 1 tion with the ports or openings 40 until the blade strikes the concentric portion of the cylinder chamber formed by the arc @-6.

In operation, the shaft 22 isV turned by any suitable means, causing the rotor to `revolve and suck fluid into the rotor chamber through the intake chamber 14, openings 15, passages 36 and openings 38. The fluid entering the roto'i' chamber through the openings38, is caught by the revolving blades and discharged through the discharge port or chamber 16. Referring to F ig. 1,v it will be Seen that as the rotor continues to revolve, the fluid in `advance of the blade 25, will flow through the openings 31 immediately in advance of said bladefinto the passages 30 and as these passages are in communication with the exit chambers 39, the fluid will pass into the said last mentioned chambers and out of the head through the opening 41 which are' in registration with that the total number of blades may be increased and hence the number of blades which act at any one time upon the fluid.

By our peculiar construction of rotor and rcylinder heads, we prevent the fluid backing up in advance of the discharge ports, which has been a serious defect in rotors of this type heretofore. Uur construction allows a free and easy egress of the fluid, therefore rendering the pump highly eflicient.

While we have shown and described the preferred embodiment of our invention, it will be apparent that minor changes in construction and arrangements of parts, such for instance as having the passages 30 of the rotor open upon one side thereof only and having only one discharge passage 39, can be made without departing from the scope and 4spirit of the invention as claimed.

Having thus described our invention, we claim 1. In a rotary pump, acylinder having an intake port and a discharge port, a rotor eccentrically mounted withinl said cylinder,

radially movable blades carried by the rotor,

cylinder heads formed with passages establishing communication between the rotor chamber and intake and discharge ports,`

said rotor being formed with passages for communication with the passages formed in the head.

2. In arotary pump, a cylinder having a rotor chamber, an intake compartment and a discharge compartment,l a vrotor eccentrically mounted within said cylinder, radially movable blades carried by the rotor, a pair of cylinder heads formed with passages which- .establish communication between the intake chamber vand the rotor chamber and between the rtor chamber and the discharge chamber, the rotor being formed with passages opening upon the periphery and the ksides thereof, to register with the discharge passage formed in the cylinder head. v v.

3. In a rotary pump, a cylinderforming a rotor chamber and having an intake chammeas?? ber and a discharge chamber, a rotor eccentrically mounted within the rotor chamber, radially movable blades carried by the rotor, and cylinder heads, one of said heads being formed with an intake passage and with a carried by the rotor, and a pair of cylinder heads closing the sides of the cylinder, each head being formed with an intake passage and a discharge passage, said passages communicating with the intake and discharge chambers respectively and with the rotor chamber, the. rotor being provided between the blades thereof with passages opening upon its periphery and upon its sides, said last mentioned passages being adapted to register with vthe discharge passages :formed in the heads. l

In testimony whereof we affix our signatures in presence of two witnesses.

DEXTER C. BAKER, HARVEY F. HANSEN.

1Witnesses:

H. A. THOMAS, JAY ERWIN BAKER. 

